You can use this link right here: https://docs.skunity.com/
Its basically like the skript version of unity's docs site. It has a list of all the conditions, events, and expressions.
For example, if you wanted to find the if statement for what world a player is in, just go to conditions and search up 'world'. You can click 'examples' on a result and it will give you even more information. It really helps out.